Intro Kit includes 16 trays (will provide trays for 5-7 patients), 2 silicone hoses for both vacuum and gas, 60ml syringe to be used with Ozone Water. No more need to take a preliminary impression and fabricate a custom traySelect the appropriate stock tray size, trim and adjust if necessary, seal and start the procedureOcclusal stops on the internal seating surface to accommodate a free space for gas circulation over teeth